Gas supersaturation in the water plays an important role in the pisciculture and Aquaristik. It means the fact that more gases are are solved in the water than corresponds to the equal in pressure weight with air. In this case the fish at the so-called gas bubble illness get sick. A gas supersaturation in the blood or in the fabric liquid is the cause of the decompression illness.

A gas supersaturation in the water can be determined and measured with a Saturometer. It comes off in Fischzuchten as fundamental in aquariums in three different ways:

• 1. by solution of air or other gases under increased pressure, how it prevails e.g. when ventilation over outlets in the depth of the water with the hydrostatic pressure. Frequently at the beginning of pipings air is in-torn in water also and goes then under the stagnation pressure and the hydrostatic pressure increased into solution. Thus the water comes surfeited with the fish basins on.

• 2. by heating up of water, which was at smaller temperature in the solution equilibrium with air. The gas solubility decreases with rising temperature, so that the solved gas forms a supersaturation after a heating up now. The typical example for this are in the pisciculture ventilated which warms up in the Fischteich. In the Aquaristik with the water change cold tap water is often ventilated and later warmed up.

• 3. by photosynthesis of aquatic plants and floating algae, which form oxygen on the day.

A supersaturation resulted from photosynthesis is again diminished usually at night by the Sauerstoffverbrauch of the respiration. The heating up of water is likewise in many cases bound to the daily cycle. Pressure induced supersaturations are however usually due and therefore durable to the technical discharge in Fischzuchten. They represent by it a special danger for the fish, because the gas bubble illness has sufficient time to its development.

Also hydro-electric power plants dismiss usually gas-surfeited water into the river, which becomes away uninhabitable thus for fish and other water animals over a certain relaxation distance.

Gas supersaturation can be removed from the water by as wide and long-term a contact with (more positive pressure-free) air as possible, e.g. by Verrieseln. In the pisciculture one reaches this by surface blower (water mushroom, impeller) or by the Verrieselung by means of filling materials or perforated plates, which are often stacked each other as cascades over.

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